Rare-earth-niobate high-entropy ceramic foams with enhanced thermal insulation performance

作     者：R.W.Yang Y.P.Liang J.Xu X.Y.Meng J.T.Zhu S.Y.Cao M.Y.Wei R.X.Zhang J.L.Yang F.Gao R.W.Yang;Y.P.Liang;J.Xu;X.Y.Meng;J.T.Zhu;S.Y.Cao;M.Y.Wei;R.X.Zhang;J.L.Yang;F.Gao

作者机构：State Key Laboratory of Solidification ProcessingMIIT Key Laboratory of Radiation Detection Materials and DevicesSchool of Materials Science and EngineeringNorthwestern Polytechnical UniversityXi’an710072China NPU-QMUL Joint Research Institute of Advanced Materials and StructureNorthwestern Polytechnical UniversityXi’an710072China State Key Laboratory of New Ceramics and Fine ProcessingSchool of Materials Science and EngineeringTsinghua UniversityBeijing100084China State Key Laboratory of Materials Processing and Die&Mould TechnologySchool of Materials Science and EngineeringHuazhong University of Science and TechnologyWuhan430074China 

出 版 物：《Journal of Materials Science & Technology》 (材料科学技术（英文版）)

年 卷 期：2022年第116卷第21期

页      面：94-102页

核心收录：

学科分类：08[工学] 0805[工学-材料科学与工程（可授工学、理学学位）] 080502[工学-材料学] 

基　　金：supported by the National Natural Science Foundation of China(No.52072301) the State Key Laboratory of Solidification Processing(NPU)(No.2021-TS-08) the State Key Laboratory of New Ceramic and Fine Processing Tsinghua University(No.KFZD202102) the China-Poland International Collaboration Fund of National Natural Science Foundation of China(No.51961135301) the Fundamental Research Funds for the Central Universities(No.D5000210722) State Key Laboratory of Materials Processing and Die&Mould Technology,Huazhong University of Science and Technology(No.P2020–009) 

主　　题：Rare-earth niobate High-entropy ceramic foams Particle-stabilized foaming Atomic-scale analysis Thermal conductivity 

摘      要：The introduction of porous structures into high-entropy ceramics is expected to further improve its thermal insulation *** this work,a series of novel rare-earth-niobate high-entropy ceramic foams((Dy_(0.2)Ho_(0.2)Y_(0.2)Er_(0.2)Yb_(0.2))_(3)NbO_(7))with hierarchical pore structures were prepared by a particle-stabilized foaming ***-scale analysis reveals that high entropy causes atom displacement and lattice *** high-entropy ceramic foams exhibit high porosity(90.13%-96.13%)and ultralow thermal conductivity(0.0343-0.0592 W/(m·K))at room ***-entropy ceramic foam prepared by a 20 wt%slurry sintered at 1500℃has the porosity of 96.12%and extremely low thermal conductivity of 0.0343 W/(m·K).The existence of walls and secondary pores contributes to reduced thermal *** is a temperature difference of over 800℃between frontside and backside of the sample under fire resistance *** research indicates that these as-prepared high-entropy ceramic foams are expected to be promising thermal insulation materials.